JP3766516B2 - Crack measuring device - Google Patents

Crack measuring device Download PDF

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Publication number
JP3766516B2
JP3766516B2 JP24035797A JP24035797A JP3766516B2 JP 3766516 B2 JP3766516 B2 JP 3766516B2 JP 24035797 A JP24035797 A JP 24035797A JP 24035797 A JP24035797 A JP 24035797A JP 3766516 B2 JP3766516 B2 JP 3766516B2
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Prior art keywords
crack
scale
slide
slide shaft
case
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JP24035797A
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JPH1163908A (en
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健 菅沼
伸好 黒澤
忠士 荒川
智成 林
岡田　　健
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Nippon Koei Co Ltd
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Nippon Koei Co Ltd
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【０００１】
【発明の属する技術分野】
本発明は、亀裂（ひび割れ）の変化を測定するための亀裂測定装置に関するもので、さらに詳しくは、ビル、橋梁などの建造物の亀裂、トンネル、道路などの土木構造物の亀裂、崩落しそうな岩石、危険な斜面などの地山の亀裂など、被測定物の近くまで接近できないような場所での亀裂の変化を正確に測定できるようにした亀裂測定装置に関するものである。
【０００２】
【従来の技術】
従来、被測定物１１の亀裂１２を測定するためには、図４ないし図７に示すような種々の方法が行われていた。
図４に示すのは、亀裂１２のある被測定物１１に近づいてノギス１３を亀裂１２に当てて直接亀裂１２の亀裂幅ｄを測定する方法である。
【０００３】
図５に示すものは、亀裂１２の両側の被測定物１１に所定間隔で２本の釘１４を打ち込んでおき、定期的にこれら２本の釘１４の間隔を測定することにより、亀裂１２の変化を観察しようとするものである。
図６に示すものは、亀裂１２の両側の被測定物１１に所定間隔で２本のアンカーボルト１５を打ち込み、これらのアンカーボルト１５にそれぞれ目印１７のついた細幅板１６を取付け、この２枚の細幅板１６を略接しながら互いに移動するように設けたもので、図５と同様に、定期的にこれら２枚の細幅板１６に設けられた目印１７の間隔から亀裂幅ｄを測定するものである。
【０００４】
図７に示すものは、３次元タイプの亀裂測定装置である。亀裂１２を挟んだ一方側の被測定物１１には、Ｘ、Ｙ目盛板１８とＺ目盛板２４が接着などにより取り付けられる。このとき、Ｘ、Ｙ目盛板１８のＸ方向目盛１９とＹ方向目盛板２０、Ｚ目盛板２４のＺ方向目盛２５は、それぞれ３次元座標のＸ、Ｙ、Ｚの各軸に合わせられる。また、亀裂１２を挟んだ他方側の被測定物１１には、透明板２１と基線板２６が接着などにより取り付けられる。このとき、透明板２１のＹ方向基線２２とＸ方向基線２３は、それぞれ前記Ｘ方向目盛１９とＹ方向目盛板２０に向かい合っており、また、基線板２６のＺ方向基線２７は、前記Ｚ方向目盛２５に向かい合っている。
そして、Ｙ方向基線２２とＸ方向目盛１９とのずれによりＸ軸方向の変化が測定され、Ｘ方向基線２３とＹ方向目盛板２０とのずれによりＹ軸方向の変化が測定され、Ｚ方向基線２７とＺ方向目盛２５とのずれによりＺ軸方向の変化が測定される。
【０００５】
【発明が解決しようとする課題】
図４に示すのは、亀裂１２の亀裂幅ｄをノギス１３で直接測定する方法であるから、正確であるが、被測定物１１に接近できない危険個所では測定することができない。
【０００６】
図５、図６に示すものは、ノギス１３などによる直接的な測定のみならず、望遠鏡、双眼鏡、写真などによる間接的な測定もできるので、被測定物１１に接近できない場合に利用される。
しかし、釘１４、アンカーボルト１５、細幅板１６などの設置方法が不安定であるとともに、望遠鏡、双眼鏡、写真などによる間接的な測定では、読取り方法が不安定であり、誤差も大きいという問題を有する。
【０００７】
図７に示す３次元タイプのものは、Ｘ、Ｙ目盛板１８、透明板２１、Ｚ目盛板２４、基線板２６をコンクリートなどの被測定物１１に直接接着するタイプなので、接着しにくかったり、剥がれたりして使いにくく、また、透明板２１とＸ、Ｙ目盛板１８とのずれが読み取りにくく、また、写真撮影の場合には、Ｘ方向目盛１９、Ｙ方向目盛板２０、Ｚ方向目盛２５とＹ方向基線２２、Ｘ方向基線２３、Ｚ方向基線２７の関係が鮮明に写らない、などの問題を有する。
【０００８】
本発明は、精度よく、確実に亀裂の変化が読取りでき、しかも、画像としても鮮明に表示できる亀裂測定装置を提供することを目的とするものである。
【０００９】
【課題を解決するための手段】
本発明は、亀裂１２を挟んだ被測定物１１の２点間に取り付けて亀裂１２の変化を測定するための亀裂測定装置において、細長の筒形をなしたスライドケース３０内に、スライドシャフト３１を進退自在に嵌合し、前記スライドケース３０に目盛窓３２を形成するとともに、この目盛窓３２の回りに目盛３３を形成し、前記目盛窓３２に臨ませてスライドシャフト３１にバーニア３４を形成し、スライドケース３０とスライドシャフト３１の端部はユニバーサルジョイント３５を介して測定個所に取り付けてなることを特徴とする亀裂測定装置である。
【００１０】
亀裂１２を挟んだ被測定物１１の２点間に亀裂測定装置を取付け、この取付け時の目盛を初期値として読み取る。
時間の経過により亀裂１２が大きくなると、目盛も変化するので、亀裂１２がどれだけ広がったかが測定される。
亀裂１２の広がる方向は、両側のブーツ３８を結んだ直線方向と必ずしも一致しない。互いに斜め方向に移動したり、上下方向に移動したりする。これらの移動に対して、両側のユニバーサルジョイント３５は、３次元のいずれの方向にも追随できるので、亀裂１２のあらゆる方向の移動も測定できる。
【００１１】
【発明の実施の形態】
本発明の一実施例を図１及び図２により説明する。
３０は、スライドケースで、このスライドケース３０を構成する材料は、アルミニウム、鉄、ステンレススチール、プラスチックなどのように、硬質で、経年変形のない材料が用いられる。また、図示例では、長さ２００ｍｍ、直径１８ｍｍの円筒形をなしている。
【００１２】
このスライドケース３０の一端（図１の右側）の内側には、ねじが切られ、また、このスライドケース３０の他端からスライドシャフト３１が進退自在に挿入されている。このスライドシャフト３１と前記スライドケース３０が円筒形をなしているため、軸方向に対して直交する方向への回動を阻止するため、図２に示すように、スライドシャフト３１の外側に長さ方向に伸びた回り止め縦溝４２が形成され、スライドケース３０の内側にこの回り止め縦溝４２に嵌合しつつ移動するための回り止め突条４１が形成されている。
なお、スライドケース３０が３角筒、４角筒、６角筒などの角筒形や、楕円筒などの円筒以外の形状である場合には、スライドシャフト３１の回り止め縦溝４２とスライドケース３０の回り止め突条４１を形成する必要がない。
【００１３】
前記スライドケース３０には、長さ方向に伸びた目盛窓３２が内外を貫通して形成され、この目盛窓３２の回りには、目盛３３が刻設されている。また、スライドシャフト３１の上面の目盛窓３２に臨ませた位置には、バーニア３４が刻設され、目盛３３よりも細かに読み取ることができるようになっている。具体的には、図１では、スライドケース３０における目盛３３の５ｃｍを１０分割したのに対して、スライドシャフト３１におけるバーニア３４の４．５ｃｍを１０分割して目盛３３の目盛よりもさらに２０分の１（０．５ｍｍ）まで読み取れるようにしたものである。さらに読み取り易くするためには、図３に示すように、目盛３３の１０ｃｍを１０分割したのに対して、バーニア３４の９ｃｍを１０分割して目盛３３の目盛の１０分の１（１．０ｍｍ）まで読み取れるようにすることもできる。
【００１４】
目盛３３とバーニア３４をはっきりと読取りができるようにするため、スライドケース３０とスライドシャフト３１の外周を黒色に着色し、数字と目盛３３とバーニア３４の部分を黄色に着色する。
【００１５】
前記スライドケース３０の一端部には、ユニバーサルジョイント３５のボール付きシャンク３７が螺着され、また、このスライドケース３０内を進退するスライドシャフト３１の他端部には、ボルト４０を介してユニバーサルジョイント３５のホルダー３６が螺着される。
【００１６】
被測定物１１の亀裂１２を挟んだ両側には、スライドケース３０の長さより少し長い間隔でそれぞれアンカーナット３９がその上端を露出するようにして埋め込まれる。
一方（図１中の右側）のアンカーナット３９には、ボルト４０を介してユニバーサルジョイント３５のホルダー３６を螺着することにより、スライドケース３０が一方のアンカーナット３９に固着される。
【００１７】
他方（図１中の左側）のアンカーナット３９には、ボルト４０を螺着する。
また、前記スライドシャフト３１を進退する。そしてスライドシャフト３１に一体に螺着されたユニバーサルジョイント３５のボール付きシャンク３７と、他方のアンカーナット３９に螺着されボルト４０が一致するようにスライドシャフト３１を進退する。一致した状態でナット４３によりボルト４０とボール付きシャンク３７を一体に固着する。
【００１８】
以上のような状態に亀裂測定装置を取付け、この取付け時の目盛を初期値として読み取る。
時間の経過により亀裂１２が大きくなると、目盛も変化するので、亀裂１２がどれだけ広がったかが測定される。
亀裂１２の広がる方向は、両側のアンカーナット３９を結んだ直線方向と必ずしも一致しない。互いに斜め方向に移動したり、上下方向に移動したりする。これらの移動に対して、両側のユニバーサルジョイント３５は、３次元のいずれの方向にも追随できるので、亀裂１２のあらゆる方向の移動も測定できる。
【００１９】
図１の実施例では、スライドケース３０の一端側にユニバーサルジョイント３５のボール付きシャンク３７を螺着し、スライドシャフト３１の他端側にボルト４０を介してユニバーサルジョイント３５のホルダー３６を螺着したが、このような取付け例に限られるものではない。スライドケース３０の一端側にボルト４０を介してユニバーサルジョイント３５のホルダー３６を螺着し、スライドシャフト３１の他端側にユニバーサルジョイント３５のボール付きシャンク３７を螺着する方法、スライドケース３０の一端側にユニバーサルジョイント３５のボール付きシャンク３７を螺着するとともに、スライドシャフト３１の他端側にもユニバーサルジョイント３５のボール付きシャンク３７を螺着する方法、その逆にスライドケース３０の一端側にボルト４０を介してユニバーサルジョイント３５のホルダー３６を螺着するとともに、スライドシャフト３１の他端側にもボルト４０を介してユニバーサルジョイント３５のホルダー３６を螺着する方法など適宜選択できる。要するに、ボルト４０やナット４３を介在したり、介在しなかったりして、スライドケース３０、スライドシャフト３１、ユニバーサルジョイント３５、アンカーナット３９の相互の固着ができればよい。
【００２０】
前記実施例では、スライドケース３０の大きさを、長さ２００ｍｍ、直径１８ｍｍとしたが、この例に限られるものではなく、亀裂１２の大きさや被測定物１１の使用場所等に応じて適宜決定できる。
【００２１】
図１の実施例では、亀裂１２を挟んだ被測定物１１の両側が同一の平面をなしているが、このような場合だけに限られるものではない。例えば、亀裂１２を挟んだ一方の面と他方の面が直交していて、その直交している隙間が広がったのか、縮んだのか、適正範囲内なのかなどを測定することもできる。この場合、アンカーナット３９の一端に螺着したボルト４０をスライドケース３０に直接螺着し、スライドシャフト３１の他端にのみユニバーサルジョイント３５を介在するようにしてもよい。
【００２２】
【発明の効果】
本発明は、細長のスライドケース３０にスライドシャフト３１を進退自在に嵌合し、これらスライドケース３０とスライドシャフト３１の少なくともいずれか一方に相互の移動距離を測定する目盛３３を形成し、前記スライドケース３０の一端とスライドシャフト３１の他端との少なくともいずれか一方にユニバーサルジョイント３５を連結したので、直接測定できるだけでなく、被測定物１１に接近できない危険個所でも測定することができる。
【００２３】
被測定物１１に接近できない場合における望遠鏡、双眼鏡、写真などによる間接的な測定において、読取り方法が安定であり、誤差も小さい。
【００２４】
アンカーナット３９により被測定物１１に確実に取り付け出来、目盛３３が読み取り易く、また、写真撮影が鮮明である。
【００２５】
精度よく、確実に亀裂１２の変化が読取りでき、しかも、画像としても鮮明に表示できる。
【図面の簡単な説明】
【図１】本発明による亀裂測定装置の一実施例を示す一部切り欠いた正面図である。
【図２】図１のＡ−Ａ線拡大断面図である。
【図３】本発明による亀裂測定装置の他の実施例の正面図である。
【図４】ノギス１３による従来の直接測定方法の説明図である。
【図５】釘１４を用いた従来の測定方法の説明図である。
【図６】アンカーボルト１５と細幅板１６を用いた従来の測定方法の説明図である。
【図７】従来の３次元測定方法の説明図である。
【符号の説明】
１１…被測定物１１、１２…亀裂、１３…ノギス、１４…釘、１５…アンカーボルト、１６…細幅板、１７…目印、１８…Ｘ、Ｙ目盛板、１９…Ｘ方向目盛、２０…Ｙ方向目盛板、２１…透明板、２２…Ｙ方向基線、２３…Ｘ方向基線、２４…Ｚ目盛板、２５…Ｚ方向目盛、２６…基線板、２７…Ｚ方向基線、３０…スライドケース、３１…スライドシャフト、３２…目盛窓、３３…目盛、３４…バーニア、３５…ユニバーサルジョイント、３６…ホルダー、３７…ボール付きシャンク、３８…ブーツ、３９…アンカーナット、４０…ボルト、４１…回り止め突条、４２…回り止め縦溝、４３…ナット。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a crack measuring apparatus for measuring changes in cracks (cracks), and more specifically, cracks in buildings such as buildings and bridges, cracks in civil engineering structures such as tunnels and roads, and the like. The present invention relates to a crack measuring apparatus capable of accurately measuring a change in a crack in a place where it cannot be approached close to an object to be measured, such as a crack in a natural ground such as a rock or a dangerous slope.
[0002]
[Prior art]
Conventionally, in order to measure the crack 12 of the DUT 11, various methods as shown in FIGS. 4 to 7 have been performed.
FIG. 4 shows a method of measuring the crack width d of the crack 12 directly by approaching the measurement object 11 having the crack 12 and applying the caliper 13 to the crack 12.
[0003]
In the case shown in FIG. 5, two nails 14 are driven into the object 11 to be measured on both sides of the crack 12 at a predetermined interval, and the interval between the two nails 14 is periodically measured, whereby the crack 12 It is intended to observe changes.
In FIG. 6, two anchor bolts 15 are driven into the object to be measured 11 on both sides of the crack 12 at predetermined intervals, and narrow plates 16 each having a mark 17 are attached to the anchor bolts 15. The narrow width plates 16 are provided so as to move while being substantially in contact with each other. Like FIG. 5, the crack width d is periodically determined from the interval between the marks 17 provided on the two narrow width plates 16. Measure.
[0004]
FIG. 7 shows a three-dimensional type crack measuring apparatus. An X and Y scale plate 18 and a Z scale plate 24 are attached to the DUT 11 on one side across the crack 12 by adhesion or the like. At this time, the X-direction scale 19 of the X and Y scale plates 18, the Y-direction scale plate 20, and the Z-direction scale 25 of the Z scale plate 24 are respectively aligned with the X, Y, and Z axes of the three-dimensional coordinates. A transparent plate 21 and a base plate 26 are attached to the object to be measured 11 on the other side across the crack 12 by adhesion or the like. At this time, the Y-direction base line 22 and the X-direction base line 23 of the transparent plate 21 face the X-direction scale 19 and the Y-direction scale board 20, respectively, and the Z-direction base line 27 of the base line plate 26 is the Z-direction. Facing the scale 25.
Then, the change in the X-axis direction is measured by the deviation between the Y-direction base line 22 and the X-direction scale 19, and the change in the Y-axis direction is measured by the deviation between the X-direction base line 23 and the Y-direction scale plate 20, and the Z-direction base line The change in the Z-axis direction is measured by the difference between the scale 27 and the Z-direction scale 25.
[0005]
[Problems to be solved by the invention]
FIG. 4 shows a method of directly measuring the crack width d of the crack 12 with the caliper 13, so that it is accurate, but cannot be measured at a dangerous place where the object to be measured 11 is not accessible.
[0006]
5 and 6 can be used not only for direct measurement with a caliper 13 or the like, but also for indirect measurement with a telescope, binoculars, a photograph, or the like, and is used when the object to be measured 11 cannot be approached.
However, the installation method of the nail 14, the anchor bolt 15, the narrow plate 16 and the like is unstable, and indirect measurement using a telescope, binoculars, photographs, etc., the reading method is unstable and the error is large. Have
[0007]
The three-dimensional type shown in FIG. 7 is a type in which the X, Y scale plate 18, the transparent plate 21, the Z scale plate 24, and the base plate 26 are directly bonded to the measured object 11 such as concrete, It is difficult to use due to peeling off, and it is difficult to read the deviation between the transparent plate 21 and the X and Y scale plates 18, and in the case of photography, the X direction scale 19, the Y direction scale plate 20, and the Z direction scale 25. And the Y-direction baseline 22, the X-direction baseline 23, and the Z-direction baseline 27 are not clearly visible.
[0008]
An object of the present invention is to provide a crack measuring apparatus that can accurately read a change in a crack with high accuracy and that can clearly display an image.
[0009]
[Means for Solving the Problems]
The present invention relates to a crack measuring apparatus for measuring changes in a crack 12 by attaching it between two points of an object to be measured 11 with a crack 12 interposed therebetween, and a slide shaft 31 in a slide case 30 having an elongated cylindrical shape. And a scale window 32 is formed on the slide case 30, and a scale 33 is formed around the scale window 32, and a vernier 34 is formed on the slide shaft 31 so as to face the scale window 32. The end part of the slide case 30 and the slide shaft 31 is attached to the measurement location via the universal joint 35, and is a crack measuring apparatus characterized by the above.
[0010]
A crack measuring device is attached between two points of the object to be measured 11 across the crack 12, and the scale at the time of attachment is read as an initial value.
As the crack 12 grows over time, the scale also changes, so it is measured how much the crack 12 has spread.
The direction in which the crack 12 spreads does not necessarily coincide with the straight direction connecting the boots 38 on both sides. They move diagonally with respect to each other and move vertically. Since the universal joints 35 on both sides can follow any three-dimensional direction with respect to these movements, the movement of the crack 12 in any direction can be measured.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described with reference to FIGS.
Reference numeral 30 denotes a slide case, and the material constituting the slide case 30 is a hard and non-deformable material such as aluminum, iron, stainless steel, or plastic. In the illustrated example, it has a cylindrical shape with a length of 200 mm and a diameter of 18 mm.
[0012]
A screw is cut inside one end (right side in FIG. 1) of the slide case 30, and a slide shaft 31 is inserted from the other end of the slide case 30 so as to be able to advance and retract. Since the slide shaft 31 and the slide case 30 have a cylindrical shape, in order to prevent rotation in a direction orthogonal to the axial direction, as shown in FIG. An anti-rotation vertical groove 42 extending in the direction is formed, and an anti-rotation protrusion 41 for moving while being fitted to the anti-rotation vertical groove 42 is formed inside the slide case 30.
When the slide case 30 has a shape other than a square tube such as a triangular tube, a quadrangular tube, or a hexagonal tube, or a cylinder such as an elliptical tube, the anti-rotation vertical groove 42 of the slide shaft 31 and the slide case There is no need to form 30 anti-rotation protrusions 41.
[0013]
A scale window 32 extending in the length direction is formed through the inside and outside of the slide case 30, and a scale 33 is engraved around the scale window 32. Further, a vernier 34 is engraved at a position facing the scale window 32 on the upper surface of the slide shaft 31 so that it can be read more finely than the scale 33. Specifically, in FIG. 1, 5 cm of the scale 33 in the slide case 30 is divided into 10 parts, whereas 4.5 cm of the vernier 34 in the slide shaft 31 is divided into 10 parts and further 20 minutes than the scale of the scale 33. 1 (0.5 mm) can be read. In order to make it easier to read, as shown in FIG. 3, 10 cm of the scale 33 is divided into 10 parts, whereas 9 cm of the vernier 34 is divided into 10 parts to 1/10 of the scale of the scale 33 (1.0 mm). ) Can also be read.
[0014]
In order to make the scale 33 and the vernier 34 clearly readable, the outer periphery of the slide case 30 and the slide shaft 31 is colored black, and the numeral, the scale 33 and the vernier 34 are colored yellow.
[0015]
A shank 37 with a ball of a universal joint 35 is screwed to one end of the slide case 30, and the universal joint 35 is connected to the other end of the slide shaft 31 that advances and retreats in the slide case 30 via a bolt 40. 35 holders 36 are screwed.
[0016]
Anchor nuts 39 are embedded on both sides of the object to be measured 11 across the crack 12 so that their upper ends are exposed at intervals slightly longer than the length of the slide case 30.
The slide case 30 is fixed to one anchor nut 39 by screwing the holder 36 of the universal joint 35 to the anchor nut 39 on one side (right side in FIG. 1) via a bolt 40.
[0017]
A bolt 40 is screwed to the other (left side in FIG. 1) anchor nut 39.
The slide shaft 31 is advanced and retracted. Then, the slide shaft 31 is advanced and retracted so that the shank 37 with a ball of the universal joint 35 integrally screwed to the slide shaft 31 and the bolt 40 are screwed to the other anchor nut 39. The bolts 40 and the ball-equipped shank 37 are firmly fixed together by the nut 43 in a state of matching.
[0018]
The crack measuring device is attached to the above state, and the scale at the time of attachment is read as an initial value.
As the crack 12 grows over time, the scale also changes, so it is measured how much the crack 12 has spread.
The direction in which the crack 12 spreads does not necessarily coincide with the straight direction connecting the anchor nuts 39 on both sides. They move diagonally with respect to each other and move vertically. Since the universal joints 35 on both sides can follow any three-dimensional direction with respect to these movements, the movement of the crack 12 in any direction can be measured.
[0019]
In the embodiment of FIG. 1, a ball-shaped shank 37 of the universal joint 35 is screwed to one end of the slide case 30, and a holder 36 of the universal joint 35 is screwed to the other end of the slide shaft 31 via a bolt 40. However, the mounting example is not limited to this. A method in which a holder 36 of the universal joint 35 is screwed to one end side of the slide case 30 via a bolt 40 and a shank 37 with a ball of the universal joint 35 is screwed to the other end side of the slide shaft 31; The ball-shaped shank 37 of the universal joint 35 is screwed to the side and the ball-shaped shank 37 of the universal joint 35 is screwed to the other end of the slide shaft 31, and vice versa. A method of screwing the holder 36 of the universal joint 35 through 40 and the method of screwing the holder 36 of the universal joint 35 through the bolt 40 to the other end of the slide shaft 31 can be selected as appropriate. In short, it is sufficient if the slide case 30, the slide shaft 31, the universal joint 35, and the anchor nut 39 can be fixed to each other with or without the bolt 40 and the nut 43 interposed therebetween.
[0020]
In the above embodiment, the size of the slide case 30 is 200 mm in length and 18 mm in diameter. However, the present invention is not limited to this example, and is appropriately determined according to the size of the crack 12 and the place of use of the object to be measured 11. it can.
[0021]
In the embodiment of FIG. 1, both sides of the DUT 11 across the crack 12 are on the same plane. However, the present invention is not limited to this case. For example, it is possible to measure whether one surface sandwiching the crack 12 and the other surface are orthogonal, and whether the orthogonal gap is widened, contracted, or within an appropriate range. In this case, the bolt 40 screwed to one end of the anchor nut 39 may be screwed directly to the slide case 30 and the universal joint 35 may be interposed only at the other end of the slide shaft 31.
[0022]
【The invention's effect】
In the present invention, a slide shaft 31 is fitted to an elongated slide case 30 so that the slide shaft 31 can be moved forward and backward, and a scale 33 for measuring a mutual movement distance is formed on at least one of the slide case 30 and the slide shaft 31. Since the universal joint 35 is connected to at least one of the one end of the case 30 and the other end of the slide shaft 31, it is possible not only to directly measure but also to measure at a dangerous place where the object to be measured 11 is not accessible.
[0023]
In indirect measurement using a telescope, binoculars, a photograph, etc. when the device under test 11 cannot be approached, the reading method is stable and the error is small.
[0024]
The anchor nut 39 can be securely attached to the object 11 to be measured, the scale 33 is easy to read, and photography is clear.
[0025]
The change of the crack 12 can be read accurately and reliably, and can be clearly displayed as an image.
[Brief description of the drawings]
FIG. 1 is a partially cutaway front view showing an embodiment of a crack measuring apparatus according to the present invention.
FIG. 2 is an enlarged cross-sectional view taken along line AA of FIG.
FIG. 3 is a front view of another embodiment of the crack measuring apparatus according to the present invention.
FIG. 4 is an explanatory diagram of a conventional direct measurement method using a caliper 13;
FIG. 5 is an explanatory diagram of a conventional measuring method using a nail 14;
FIG. 6 is an explanatory view of a conventional measuring method using an anchor bolt 15 and a narrow plate 16;
FIG. 7 is an explanatory diagram of a conventional three-dimensional measurement method.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 11 ... To-be-measured object 11, 12 ... Crack, 13 ... Caliper, 14 ... Nail, 15 ... Anchor bolt, 16 ... Narrow board, 17 ... Mark, 18 ... X, Y scale board, 19 ... X direction scale, 20 ... Y direction scale plate, 21 ... transparent plate, 22 ... Y direction base line, 23 ... X direction base line, 24 ... Z scale plate, 25 ... Z direction scale, 26 ... base line plate, 27 ... Z direction base line, 30 ... slide case, 31 ... Slide shaft, 32 ... Scale window, 33 ... Scale, 34 ... Vernier, 35 ... Universal joint, 36 ... Holder, 37 ... Shank with ball, 38 ... Boot, 39 ... Anchor nut, 40 ... Bolt, 41 ... Non-rotating Projections, 42 ... non-rotating longitudinal grooves, 43 ... nuts.

Claims (4)

亀裂１２を挟んだ被測定物１１の２点間に取り付けて亀裂１２の変化を測定するための亀裂測定装置において、細長のスライドケース３０にスライドシャフト３１を進退自在に嵌合し、これらスライドケース３０とスライドシャフト３１の少なくともいずれか一方に相互の移動距離を測定する目盛３３を形成し、前記スライドケース３０とスライドシャフト３１の端部はユニバーサルジョイント３５を介して測定個所に取り付けてなることを特徴とする亀裂測定装置。In a crack measuring apparatus for measuring changes in a crack 12 by attaching it between two points of an object to be measured 11 with a crack 12 sandwiched between them, a slide shaft 31 is slidably fitted into an elongated slide case 30 and these slide cases A scale 33 for measuring the mutual movement distance is formed on at least one of 30 and the slide shaft 31, and the ends of the slide case 30 and the slide shaft 31 are attached to measurement points via a universal joint 35. A crack measuring device characterized by the above. スライドケース３０は、筒形をなし、このスライドケース３０内にスライドシャフト３１を進退自在に嵌合し、前記スライドケース３０に目盛窓３２を形成するとともに、この目盛窓３２の回りに目盛３３を形成し、前記目盛窓３２に臨ませてスライドシャフト３１にバーニア３４を形成してなることを特徴とする請求項１記載の亀裂測定装置。  The slide case 30 has a cylindrical shape, and a slide shaft 31 is fitted into the slide case 30 so as to be able to advance and retract. A scale window 32 is formed in the slide case 30, and a scale 33 is formed around the scale window 32. The crack measuring apparatus according to claim 1, wherein a vernier 34 is formed on the slide shaft 31 so as to face the scale window 32. スライドケース３０は、筒形をなし、このスライドケース３０内にスライドシャフト３１を進退自在に嵌合し、前記スライドケース３０に目盛窓３２を形成するとともに、この目盛窓３２の回りにバーニア３４を形成し、前記目盛窓３２に臨ませてスライドシャフト３１に目盛３３を形成してなることを特徴とする請求項１記載の亀裂測定装置。  The slide case 30 has a cylindrical shape, and a slide shaft 31 is fitted into the slide case 30 so as to be able to advance and retract. A scale window 32 is formed in the slide case 30, and a vernier 34 is provided around the scale window 32. The crack measuring apparatus according to claim 1, wherein a scale 33 is formed on the slide shaft 31 so as to face the scale window 32. スライドケース３０の一端とスライドシャフト３１の他端とにそれぞれユニバーサルジョイント３５を結合し、これらのユニバーサルジョイント３５を亀裂１２を挟んだ被測定物１１の２点間に取り付けるようにしたことを特徴とする請求項１、２または３記載の亀裂測定装置。  A universal joint 35 is coupled to one end of the slide case 30 and the other end of the slide shaft 31, and these universal joints 35 are attached between two points of the measured object 11 with the crack 12 interposed therebetween. The crack measuring device according to claim 1, 2 or 3.
JP24035797A 1997-08-21 1997-08-21 Crack measuring device Expired - Lifetime JP3766516B2 (en)

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